Suzuki GSX-R750 Service Manual page 193

4-46 FI SYSTEM AND INTAKE AIR SYSTEM
4-A
Turn the ignition switch OFF.
Check the continuity between Yellow wire and ground.
Position sensor continuity: ∞Ω
If OK, then measure the position sensor resistance.
Connect the position sensor coupler 1.
Set the STV actuator to adjustment position. (4-61)
Disconnect the position sensor coupler 1 and measure
the resistence. (between Yellow and White wires)
Position sensor resistance
Adjustment position: Approx. 3.1 kΩ Ω Ω Ω Ω
[ 09900-25008: Multi circuit tester
U Tester knob indication: Resistance (Ω Ω Ω Ω Ω )
Yes
5-A
Turn the ignition switch OFF.
Measure the position sensor output voltage at fully close
position and fully open position.
Insert the copper wires into the back side of the position
sensor lead wire coupler.
Disconnect the STVA motor lead wire coupler 2.
To set the ST valve to fully close position, apply 12 volts
to A and B terminals.
Positive wire – A (Pink wire) terminal
Negative wire – B (Gray wire) terminal
Turn the ignition switch ON.
Measure the position sensor output voltage at fully close
position.
Then, to set the ST valve to fully open position, apply 12
volts to B and A terminals.
Positive wire – B (Gray wire) terminal
Negative wire – A (Pink wire) terminal
Measure the position sensor output voltage at fully open
position.
Position sensor output voltage
[ 09900-25008: Multi circuit tester
V Tester knob indication: Voltage (
No
To 6-A (Next page)
∞Ω ∞Ω (Infinity) ∞Ω ∞Ω
(+ Yellow – - White)
No
Replace the STV actuator
with a new one.
ST valve is fully close: 0.2 – 0.8 V
ST valve is fully open: 4.2 – 4.8 V
(+ Yellow – - B/Br)
)
Yes
Replace the ECM
with a new one.
4-A
Yellow Yellow
White White
4-A
5-A
Pink Pink
Gray Gray
12 V
5-A
V
B/Br B/Br
5-A
Pink Pink
Gray Gray
12 V
Ground Ground
Yellow Yellow